We recently reported that very compact coupled-cluster wave functions may be
generated by selecting the most important configurations, by weight, from the
full coupled-cluster wave function. Here, we consider how the choice of
orbitals may affect these wave functions in the case of the symmetric
dissociation of H2O. We employ unrestricted Hartree-Fock and
complete-active-space self-consistent-field orbitals, as well as natural
orbitals derived from a coupled-cluster singles and doubles wave function.
For a given accuracy, some choices of orbitals can reduce the size of
configuration interaction wave functions, but they have little effect on the
weight-selected coupled-cluster wave functions.